flexsearch: only display 'no results' message if search query is not empty

assets/js/index.js

@@ -134,7 +134,7 @@ Source:
     suggestions.classList.remove('d-none');
 
     // inform user that no results were found
-    if (flatResults.size === 0) {
+    if (flatResults.size === 0 && searchQuery) {
       const noResultsMessage = document.createElement('div')
       noResultsMessage.innerHTML = `No results for "<strong>${searchQuery}</strong>"`
       noResultsMessage.classList.add("suggestion__no-results");